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Appendix V.

991

is out of gear. The centre-cutting tool is next removed, a left-
side cutter inserted, and the lateral feed coupled up for a rela-
tively leftward motion of the tool: thus removing the full amount

of the interspa.ce on the left side, as shewn at /, Fig. 913; and
this goes on, with the use of the dividing plate, until the left half
of the interspaces of all the teeth a,re cut out. The spaces are
again centred, and a right-side tool similarly used for the right